本文共 5843 字,大约阅读时间需要 19 分钟。
图形验证码生成工具类:
package com.jm.util;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Date;import java.util.Random;/** * 验证码生成器 * * @author */public class ImageValidateUtil { // 图片的宽度。 private int width = 160; // 图片的高度。 private int height = 40; // 验证码字符个数 private int codeCount = 5; // 验证码干扰线数 private int lineCount = 150; // 验证码 private String code = null; // 验证码图片Buffer private BufferedImage buffImg = null; // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了) private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'}; /** * 默认构造函数,设置默认参数 */ public ImageValidateUtil() { this.createCode(); } /** * @param width 图片宽 * @param height 图片高 */ public ImageValidateUtil(int width, int height) { this.width = width; this.height = height; this.createCode(); } /** * @param width 图片宽 * @param height 图片高 * @param codeCount 字符个数 * @param lineCount 干扰线条数 */ public ImageValidateUtil(int width, int height, int codeCount, int lineCount) { this.width = width; this.height = height; this.codeCount = codeCount; this.lineCount = lineCount; this.createCode(); } public void createCode() { int x = 0, fontHeight = 0, codeY = 0; int red = 0, green = 0, blue = 0; x = width / (codeCount + 2);//每个字符的宽度(左右各空出一个字符) fontHeight = height - 2;//字体的高度 codeY = height - 4; // 图像buffer buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = buffImg.createGraphics(); // 生成随机数 Random random = new Random(); // 将图像填充为白色 g.setColor(Color.WHITE); g.fillRect(0, 0, width, height); // 创建字体,可以修改为其它的 Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);// Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight); g.setFont(font); for (int i = 0; i < lineCount; i++) { // 设置随机开始和结束坐标 int xs = random.nextInt(width);//x坐标开始 int ys = random.nextInt(height);//y坐标开始 int xe = xs + random.nextInt(width / 8);//x坐标结束 int ye = ys + random.nextInt(height / 8);//y坐标结束 // 产生随机的颜色值,让输出的每个干扰线的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red, green, blue)); g.drawLine(xs, ys, xe, ye); } // randomCode记录随机产生的验证码 StringBuffer randomCode = new StringBuffer(); // 随机产生codeCount个字符的验证码。 for (int i = 0; i < codeCount; i++) { String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); // 产生随机的颜色值,让输出的每个字符的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red, green, blue)); g.drawString(strRand, (i + 1) * x, codeY); // 将产生的四个随机数组合在一起。 randomCode.append(strRand); } // 将四位数字的验证码保存到Session中。 code = randomCode.toString(); } public void write(String path) throws IOException { OutputStream sos = new FileOutputStream(path); this.write(sos); } public void write(OutputStream sos) throws IOException { ImageIO.write(buffImg, "png", sos); sos.close(); } public BufferedImage getBuffImg() { return buffImg; } public String getCode() { return code; } /** * 测试函数,默认生成到d盘 * @param args */ public static void main(String[] args) { ImageValidateUtil vCode = new ImageValidateUtil(160,40,5,150); try { String path="D:/"+new Date().getTime()+".png"; System.out.println(vCode.getCode()+" >"+path); vCode.write(path); } catch (IOException e) { e.printStackTrace(); } }}
controller层输出验证码:
/** * 响应生成图片验证码 * @return * @throws IOException */ @RequestMapping(value="/generateImageCode") @ResponseBody public Mapcontroller层验证验证码输入是否正确:generateImageCode() throws IOException{ Map resultMap = new HashMap (); HttpServletResponse response = this.getResponse(); // 设置响应的类型格式为图片格式 response.setContentType("image/jpeg"); //禁止图像缓存。 response.setHeader("Pragma", "no-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); Session session = SessionUtil.getSession(); ImageValidateUtil imageValidateUtil = new ImageValidateUtil(120,40,4,100); String imageCode = imageValidateUtil.getCode(); session.setAttribute("imageCode", imageCode); imageValidateUtil.write(response.getOutputStream()); resultMap.put("result", true); resultMap.put("imageCode", imageCode); return resultMap; }
/** * 验证图片验证码是否正确 * @return * @throws IOException */ @RequestMapping(value="/validateImageCode") @ResponseBody public Map页面调用验证码:validateImageCode() throws IOException{ Map resultMap = new HashMap (); //页面传递的验证码 String imageCode = paramString("imageCode"); Session session = SessionUtil.getSession(); String sessionCode = (String) session.getAttribute("imageCode"); if (imageCode.equalsIgnoreCase(sessionCode)) { //忽略验证码大小写 resultMap.put("result", true); }else{ resultMap.put("result", false); } return resultMap; }
效果图如下: